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The Ruger SR556 is a revolutionary rifle patterned on the AR15/M4. Instead of the dirty direct gas impingement system, the SR556 uses a chrome plated two stage piston driven operating system for superior reliability.

The system has a 4 position chrome plated gas regulator, allowing the reliable use of virtually any 5.56 or .223 ammunition: from cheap surplus to high end precision rounds. It even allows the shooter to prevent the system from cycling for the ultimate in quiet, precision shooting.